Analog Devices Inc./Maxim Integrated MAX4292EUA

Overview

MAX4292EUA from Maxim Integrated is a dual, micropower, rail-to-rail input/output operational amplifier optimized for low-voltage, battery-powered systems. It operates from 1.8V to 5.5V single supply (or ±0.9V to ±2.75V dual), draws only 100µA per amplifier, delivers 500kHz gain-bandwidth, achieves 120dB open-loop gain, and features ±200µV input offset voltage - enabling high-precision signal conditioning in portable instrumentation and sensor interfaces.

For engineers reviewing the MAX4292EUA datasheet, MAX4292EUA pinout, MAX4292EUA application, or MAX4292EUA equivalent, key selection criteria include ultra-low quiescent current, guaranteed 1.8V operation, rail-to-rail I/O swing within 46mV of rails into 2kΩ, unity-gain stability with ≤100pF capacitive loads, and compatibility with two-cell alkaline/NiMH/Li-ion battery stacks.

Technical Context

The MAX4292EUA employs a composite NPN/PNP input stage enabling true rail-to-rail common-mode input range (0V to VCC) and eliminating phase reversal on overdriven inputs. Its output stage uses complementary push-pull circuitry capable of sourcing/sinking ≥3.5mA while maintaining rail-to-rail swing under load.

It is unity-gain stable with capacitive loads up to 100pF and exhibits no sustained oscillation at AV = 1V/V. Input protection includes 10.6kΩ series resistors and back-to-back triple-diode stacks, yielding 0.75MΩ differential input resistance below 1.8V differential input.

Key Specifications

Pinout & Package

The MAX4292EUA is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), a compact surface-mount SOIC variant with exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual micropower rail-to-rail op amp applications.

Compared with TLV2462IDR and OPA2333AIDR, the MAX4292EUA uniquely balances ultra-low 100µA supply current, guaranteed 1.8V operation, and rail-to-rail I/O in a space-constrained µMAX package - making it optimal for two-cell battery-powered portable equipment where runtime and board area are critical.

Availability

MAX4292EUA is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, and digital weight scales requiring stable component supply across extended production lifecycles.

Supply support for MAX4292EUA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX4291/MAX4292/MAX4294 family was engineered specifically for ultra-low-power, rail-to-rail signal conditioning in space-constrained, battery-operated systems - prioritizing 1.8V operation, micropower consumption, and minimal PCB footprint.

FAQ

What is the minimum supply voltage guaranteed for continuous operation of the MAX4292EUA?

The MAX4292EUA is fully specified and guaranteed for continuous operation down to 1.8V single supply (or ±0.9V dual supply). While typical operation may extend to 1.5V, design margins must be based on the 1.8V limit documented in the Absolute Maximum Ratings and Electrical Characteristics tables of the MAX4292EUA datasheet.

Does the MAX4292EUA support rail-to-rail output swing into a 10kΩ load?

Yes, the MAX4292EUA delivers rail-to-rail output swing into 10kΩ loads - its output can swing to within 25mV of the rails with a 100kΩ load and within 46mV with a 2kΩ load. For 10kΩ, the swing remains within ~30mV of each rail, preserving >97% of full-scale dynamic range in 1.8V systems.

Can the MAX4292EUA be used as a comparator, and what is its typical propagation delay?

Yes, the MAX4292EUA can function as a rail-to-rail I/O comparator. At VCC = 1.8V and 100mV input overdrive, typical propagation delay is ~90µs for rising edge and ~70µs for falling edge. Supply current increases to ~1.5mA in comparator mode, so this usage is best reserved for infrequent threshold detection rather than high-speed clocking.

What is the maximum capacitive load the MAX4292EUA can drive without external isolation?

The MAX4292EUA is unity-gain stable with capacitive loads up to 100pF, as confirmed in the Load Resistor vs. Capacitive Load graph (Figure 19) of the MAX4292EUA datasheet. Driving larger capacitive loads (e.g., >200pF) requires a series isolation resistor (e.g., 100Ω) between the output and load to prevent peaking or oscillation.

How does the input bias current of the MAX4292EUA behave across the common-mode voltage range?

The MAX4292EUA's input bias current changes polarity near the midpoint of VCC–VEE due to its dual NPN/PNP input stage. At VCC = 1.8V, IB ranges from –90nA to +90nA across 0V to 1.8V common-mode voltage, crossing zero near 0.9V. Matching source impedances at INA+ and INA− minimizes offset error caused by this bipolar bias current.